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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a68:b0:365:3e12:3eb1 with SMTP id w8-20020a056e021a6800b003653e123eb1mr684636ilv.1.1709559182899; Mon, 04 Mar 2024 05:33:02 -0800 (PST) Date: Mon, 04 Mar 2024 05:33:02 -0800 In-Reply-To: <20240304104457.1348-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d1c9260612d5c377@google.com> Subject: Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in sys_io_cancel From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Read in sys_io_cancel ================================================================== BUG: KASAN: slab-use-after-free in __do_sys_io_cancel fs/aio.c:2212 [inline] BUG: KASAN: slab-use-after-free in __se_sys_io_cancel+0x3a2/0x3b0 fs/aio.c:2174 Read of size 4 at addr ffff88801fe56020 by task syz-executor.0/5491 CPU: 0 PID: 5491 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-g90d35da658da-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 __do_sys_io_cancel fs/aio.c:2212 [inline] __se_sys_io_cancel+0x3a2/0x3b0 fs/aio.c:2174 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f963407dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9634ed70c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d2 RAX: ffffffffffffffda RBX: 00007f96341abf80 RCX: 00007f963407dda9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 00007f9634eb6000 RBP: 00007f96340ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f96341abf80 R15: 00007ffc37361bc8 Allocated by task 5491: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x154/0x18b0 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit+0x17f/0x300 fs/aio.c:2083 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 5082: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x102/0x2a0 mm/slub.c:4363 aio_poll_complete_work+0x467/0x670 fs/aio.c:1767 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:551 insert_work+0x3e/0x330 kernel/workqueue.c:1653 __queue_work+0xbf4/0x1000 kernel/workqueue.c:1802 queue_work_on+0x14f/0x250 kernel/workqueue.c:1837 queue_work include/linux/workqueue.h:548 [inline] schedule_work include/linux/workqueue.h:609 [inline] aio_poll_cancel+0xbb/0x130 fs/aio.c:1779 __do_sys_io_cancel fs/aio.c:2196 [inline] __se_sys_io_cancel+0x122/0x3b0 fs/aio.c:2174 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff88801fe56000 which belongs to the cache aio_kiocb of size 216 The buggy address is located 32 bytes inside of freed 216-byte region [ffff88801fe56000, ffff88801fe560d8) The buggy address belongs to the physical page: page:ffffea00007f9580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fe56 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff88801772adc0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5491, tgid 5490 (syz-executor.0), ts 90500359314, free_ts 90328660331 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc+0x24d/0x340 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x154/0x18b0 fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit+0x17f/0x300 fs/aio.c:2083 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 page last free pid 5470 tgid 5470 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page_list+0x5a3/0x850 mm/page_alloc.c:2532 release_pages+0x2744/0x2a80 mm/swap.c:1042 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:392 exit_mmap+0x4b6/0xd40 mm/mmap.c:3292 __mmput+0x115/0x3c0 kernel/fork.c:1343 exit_mm+0x21f/0x310 kernel/exit.c:569 do_exit+0x9af/0x2740 kernel/exit.c:858 do_group_exit+0x206/0x2c0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1029 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff88801fe55f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff88801fe55f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801fe56000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801fe56080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff88801fe56100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Tested on: commit: 90d35da6 Linux 6.8-rc7 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1665e3ca180000 kernel config: https://syzkaller.appspot.com/x/.config?x=c11c5c676adb61f0 dashboard link: https://syzkaller.appspot.com/bug?extid=b91eb2ed18f599dd3c31 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=12d5b14c180000